GitHub user willb opened a pull request:
https://github.com/apache/spark/pull/15105
[SPARK-17548] [MLlib] Word2VecModel.findSynonyms no longer spuriously
rejects the best match when invoked with a vector
## What changes were proposed in this pull request?
This pull request changes the behavior of `Word2VecModel.findSynonyms` so
that it will not spuriously reject the best match when invoked with a vector
that does not correspond to a word in the model's vocabulary. Instead of
blindly discarding the best match, the changed implementation discards a match
that corresponds to the query word (in cases where `findSynonyms` is invoked
with a word) or that has an identical angle to the query vector.
## How was this patch tested?
I added a test to `Word2VecSuite` to ensure that the word with the most
similar vector from a supplied vector would not be spuriously rejected.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/willb/spark fix/findSynonyms
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15105.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #15105
----
commit 5a7cf31e1c76c2fe4e172c2889fa23deb2152af9
Author: William Benton <[email protected]>
Date: 2016-09-14T17:07:14Z
test for spurious rejection of similar vectors in findSynonyms
commit 757ce7c73e76f751395d55de3b5b31fa4a05cde8
Author: William Benton <[email protected]>
Date: 2016-09-14T21:35:29Z
`Word2VecModel.findSynonyms` no longer spuriously rejects the best match
Previously, the `findSynonyms` method in `Word2VecModel` rejected the
closest-matching vector. This was typically correct in cases where we
were searching for synonyms of a word, but was incorrect in cases
where we were searching for words most similar to a given vector,
since the given vector might not correspond to a word in the model's
vocabulary.
With this commit, `findSynonyms` will not discard the best matching
term unless the best matching word is also the query word (or is
maximally similar to the query vector).
----
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